Extrusion & Post
4 Aufrufe
Melt fracture on ABS extrusion surface
Problembeschreibung
Periodic roughness, sharkskin-like or orange-peel-like texture appears on the surface of ABS extruded plates/sheets, more obvious after the line speed increases.
Ursachenanalyse
The shear stress of the melt at the die lip outlet exceeds the critical value and melt fracture occurs; low die temperature and too fast extrusion speed are common inducements, and ABS's viscosity characteristics make it more easily triggered during high-speed extrusion.
Lösung
①Increase the die temperature by 3~5℃; ②reduce the screw speed/line speed; ③clean and polish the die lip; ④add fluorine-containing processing aid (PPA) when necessary; ⑤evaluate easy-processing grades for stubborn cases.
Wichtigste Erkenntnis
The main line for ABS extrusion surface roughness is 'reducing outlet shear': raise temperature, reduce speed, polish, and add PPA in sequence; when pursuing output, find the balance point between speed and surface quality.
War das hilfreich?
0 Personen fanden dies hilfreich
Vielen Dank für Ihr Feedback!